Docs-as-code: full deploy configs, compose stacks, and DR guide

- Add root README and docs/ (architecture, hosts, disaster-recovery, operations)
- Add compose/ for superset, forgejo, lam, cadvisor; unified deploy compose
- Add scripts/deploy (deploy-atc-docker01.sh, container inventory export)
- Add inventory/containers-atc-docker01.json snapshot
- Add config READMEs for kafka and airflow; .env.example; expand .gitignore
- Sync atclab helper scripts; update homepage/superset compose with env support

docs/architecture.md

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+# Architectuur — ATC Lakehouse
+
+## Dataflow (conceptueel)
+
+```mermaid
+flowchart LR
+  subgraph sources [Bronnen]
+    DB1[(atc-db01)]
+    DB2[(atc-db02)]
+  end
+
+  subgraph ingest [Ingest]
+    DEB[Debezium]
+    KAFKA[Kafka]
+  end
+
+  subgraph lake [Lake]
+    SPARK[Spark]
+    TRINO[Trino]
+    ICE[Iceberg tables]
+  end
+
+  subgraph consume [Consumptie]
+    SS[Superset]
+    KB[Kibana]
+    GF[Grafana]
+  end
+
+  DB1 --> DEB
+  DB2 --> DEB
+  DEB --> KAFKA
+  KAFKA --> SPARK
+  SPARK --> ICE
+  TRINO --> ICE
+  TRINO --> SS
+  KAFKA --> SS
+```
+
+## Lagen
+
+| Laag | Componenten | Doel |
+|------|-------------|------|
+| **Bron** | PostgreSQL, MySQL, MongoDB, Cassandra, Neo4j | OLTP / events / graph demo data |
+| **Ingest** | Debezium, Kafka Connect | CDC naar Kafka topics |
+| **Processing** | Spark, Airflow | ETL, batch, orchestratie |
+| **Query** | Trino | Federated SQL over lake + bronnen |
+| **Storage** | ObjectScale / MinIO (indien actief) | Object storage |
+| **Analytics** | Superset, Kibana | BI en search UI |
+| **Platform** | Proxmox, Docker hosts | VMs en containers |
+| **Ops** | Homepage dashboard, Grafana | Zichtbaarheid en links |
+
+## atc-docker01 — centrale dashboard-host
+
+Draait de **gethomepage**-dashboard (poort 80), **RSS-proxy** (8090), **icon server** (8080), **Apache Superset** (8088), en optioneel lokale **Forgejo** (4002) / **LAM** (4001).
+
+Configuratiepad op de host: `/root/lakehouse/config/homepage` → gemount in container `/app/config`.
+
+## Configuratie in git
+
+| Pad | Beschrijving |
+|-----|--------------|
+| `config/kafka/*.json` | Debezium/Kafka Connect connector definities |
+| `config/trino/config.properties` | Trino coordinator (single-node) |
+| `config/spark/spark-defaults.conf` | Spark defaults |
+| `config/airflow/` | Airflow DAG + `airflow.cfg` |
+| `config/superset/` | Superset Python config + compose |
+| `config/homepage/` | Volledige dashboardconfiguratie |